This diagonal can only be used with refractor telescopes and some catadioptric telescopes like Schmidt-Cassegrain, Maksutov-Cassegrain, etc. It not meant for use with Newtonian / DOB reflector telescopes or other variants of Newtonian telescopes.

SVBONY SV221 1.25-Inch 45 Degree Correct Image Prism Diagonal Provides Sharp Views That Are Right-Side-Up and Correct Left-To-Right for Refractor Telescope

 

SV221  1.25" 45 Degree Correct Image Prism Diagonal -- For Moon & Planets Viewing

Enhanced aluminum die/coated prism
The brass pressure ring design
Built-in prism steering system
Internal extinction treatment
Support connection 1.25inch filter
Large thumb screws

The main mirror housing is made of precision molded ABS plastic. The two end barrels are precision machined from aluminum, enhanced aluminum die/coated prism with higher light transmittance & clearer vision.

Built-in prism steering system & support connection 1.25inch filter, internal extinction treatment.

Brass lock Screw for eyepiece or adapter and brass Compression rings features more precision and prevent barrels or the surface of eyepieces from marring and scratching.

Package Includes:

SV221 1.25" 45 Degree Correct image Prism Diagonal
3PCS M3 Screws
1PCS Dust Cap
1PCS Dust Plug

Specifications:

Brand	SVBONY
Model	SV221
Size	1.25 inch
Optical Design​	Prism Diagonal​
Inner Connection (Lens Sided)​	Thread M28.5x0.6​
Outer Connection (Lens Sided)	Barrel 1.25 inch
Inner Connection (Eyepiece Sided)	Clamp 1.25 inch
Coating	Multi-Coated (MC)
Image Orientation	Erect image, non-reversed​
Optical Length	approx. 86mm​
Clamping System	Screw Clamps
Deflection Angle	45°
Clear Aperture	19mm
Material	Plastic & Metal
Net Weight	79g/2.78oz